Yes, even an older Virga or Virga II (recommended) would be plenty large for you. I am 6' and around 198. With a Virga II, I fit in it great with room to spare even with my 10 year old daughter, although we maxed out it's width.
As far as sewing goes, I have had a little sewing experience, but not enough to work with silnylon effectively yet. The stuff is really slick and, to me, harder to work with than non-siliconized materials.
Hope this provides a little light.